CN215219203U

CN215219203U - Microwave detection device with adjustable beam angle

Info

Publication number: CN215219203U
Application number: CN202121321559.6U
Authority: CN
Inventors: 邹高迪; 邹新; 郭灵
Original assignee: Shenzhen Merrytek Technology Co Ltd
Current assignee: Shenzhen Merrytek Technology Co Ltd
Priority date: 2021-03-16
Filing date: 2021-06-11
Publication date: 2021-12-17
Anticipated expiration: 2031-06-11

Abstract

The utility model relates to a Doppler microwave detection field, in particular to a microwave detection device with adjustable beam angle, wherein the microwave detection device with adjustable beam angle comprises a plane reference ground, a radiation source and a beam adjusting medium and has an origin, wherein the radiation source is arranged at one side of the plane reference ground in a state of being spaced from the plane reference ground, wherein the directional radiation direction is in a direction perpendicular to the plane reference ground, from the plane reference ground to the direction of the radiation source, wherein the origin is taken as a sphere center, and the beam adjusting medium defines a near-field medium space by taking lambda/2 as an inner radius and 3 lambda/2 as an outer radius, wherein the beam adjusting medium is arranged in the near-field medium space by all or part of the directional radiation direction around the microwave detection device with adjustable beam angle, wherein λ is a wavelength parameter corresponding to a frequency parameter of the adjustable beam angle microwave detection apparatus.

Description

Microwave detection device with adjustable beam angle

Technical Field

The utility model relates to a doppler microwave detection field, in particular to microwave detection device of adjustable beam angle.

Background

The microwave detection technology has unique advantages in the behavior detection and existence detection technology as an important junction between human and object, the important junction between the object and the object is connected with the microwave detection technology, the microwave detection technology can generate a Doppler intermediate frequency signal corresponding to the frequency difference between a microwave beam and a reflected echo by the corresponding object by transmitting the microwave beam and receiving the reflected echo formed by the reflection of the microwave beam by the corresponding object under the condition of not invading the privacy of the human, thereby feeding back the motion of the corresponding object by the Doppler intermediate frequency signal, and when the microwave detection technology is applied to the detection of the human body activity, the detection of the respiration and heartbeat activity of the human body is included, the intelligent interconnection between the human and the object can be realized, and the microwave detection technology has wide application prospect, however, due to the lack of an effective control means of electromagnetic radiation, namely a shaping means of the gradient boundary of the corresponding microwave beam, mainly reflected in the lack of adjusting means for the beam angle of the microwave beam, the actual detection space of the existing microwave detection module is difficult to control, and correspondingly causes the situation that the actual detection space of the existing microwave detection module is not matched with the corresponding target detection space, so that the problems of poor detection accuracy and/or poor anti-interference performance of the existing microwave detection module are caused in the state that the target detection space outside the actual detection space cannot be effectively detected and/or the state that the actual detection space outside the target detection space has environmental interference, including motion interference, electromagnetic interference and self-excitation interference caused by electromagnetic shielding environment, namely, due to the lack of shaping means for the gradient boundary of the microwave beam, the actual detection space of the existing microwave detection module is difficult to match with the corresponding target detection space in the actual application, the existing microwave detection module has the defects of limited adaptability to different application scenes and poor detection stability in practical application.

Specifically, taking an existing microwave detection module adopting a planar radiation source structure as an example, referring to fig. 1A to 1C, a structure of the microwave detection module and a radiation pattern corresponding to the structure and a radiation distribution scenario of the microwave detection module in a vertical detection application are respectively illustrated, wherein the microwave detection module includes a reference ground 10P and a planar radiation source 20P, wherein the planar radiation source 20P and the reference ground 10P are disposed at an interval in a state of being approximately parallel to each other, wherein the radiation source 20P is disposed and has only one feeding point 21P, and in a state of the radiation source 20P being fed at the feeding point 21P, the radiation source 20P generates polarization with a direction from the feeding point 21P to a physical center point of the radiation source 20P as a polarization direction, and a polarization direction is established between the radiation source 20P and the reference ground 10P corresponding to the coupling of the radiation source 20P and the reference ground 10P An initial electric field, specifically defined by the boundary of the radiation source 20P as an inner electric field and an outer electric field, wherein the inner electric field is an electric field established between the radiation source 20P and the ground reference 10P in a direction perpendicular to the radiation source 20P and the ground reference 10P at the same time, and the outer electric field is an electric field established between the radiation source 20P and the ground reference 10P not in a direction perpendicular to the radiation source 20P and the ground reference 10P at the same time, and wherein the outer electric field is capable of forming a radiation near field and further a radiation far field to form the emission of a microwave beam based on the alternating propagation of the electric field and the magnetic field. That is, the energy and direction of the external electric field is directly related to the radiation gain and gradient boundaries of the microwave beam, i.e. the boundaries at which the radiated energy of the microwave beam is attenuated to a certain extent, corresponding to the boundaries of the solid radiation pattern illustrated in fig. 1B, are mainly characterized by the beam angle of the microwave beam, i.e. in the two-dimensional radiation pattern of the microwave detection module illustrated in figure 1C in a directed radiation direction (corresponding to the Z-axis direction in figure 1B), the physical center point of the radiation source 20P is taken as the origin, the angle at the position where the energy of the gradient boundary is reduced by half (-3dB), based on the above structure of the microwave detection module, the beam angle of the corresponding microwave beam is limited to 70-80 degrees and is difficult to be adjusted, so that it is difficult to match various target detection spaces in practical application. For example, in a detection application, when a target detection area is small, an actual detection space outside the target detection space has an environmental interference state, including motion interference, electromagnetic interference and self-excitation interference caused by an electromagnetic shielding environment, which causes a problem that an existing microwave detection module has poor detection accuracy and/or poor anti-interference performance, and is difficult to overcome based on microwave penetration characteristics.

That is, based on the penetration characteristic and the diffraction characteristic of the microwave, different from the propagation of the optical wave, the propagation of the microwave is difficult to control, and the gradient boundary of the corresponding microwave beam is difficult to be shaped to match the corresponding target detection space, which causes the defect that the existing microwave detection module has limited adaptability to different application scenarios and has poor detection stability in practical applications. Therefore, the microwave detection module with the adjustable beam angle is designed to shape the gradient boundary of the microwave beam to match the corresponding target detection space in practical application, and the microwave detection module has important significance for reducing the cost of the microwave detection technology in practical application, improving the detection accuracy and/or the anti-interference performance of the microwave detection technology in practical application and popularizing the microwave detection technology.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a microwave detection device of adjustable beam angle, wherein the structure of the microwave detection device of adjustable beam angle can form corresponding beam angle and for the state that current microwave detection module is narrowed to form the plastic to the gradient boundary of corresponding microwave beam and match corresponding target detection space in practical application, therefore be favorable to improving in practical application the microwave detection device of adjustable beam angle's detection precision and interference killing feature.

Another object of the utility model is to provide a microwave detection device of adjustable beam angle, wherein the microwave detection device of adjustable beam angle's structure can form corresponding beam angle and allow the state of being adjusted for current microwave detection module, and the gradient boundary of corresponding microwave beam allows to be reshaped in order to match corresponding target detection space in practical application promptly, thereby is favorable to improving the adaptability of microwave detection device of adjustable beam angle to corresponding target detection space is with improve in practical application the microwave detection device's of adjustable beam angle detection precision and interference killing feature.

Another object of the present invention is to provide a microwave detecting device with adjustable beam angle, wherein the microwave detecting device with adjustable beam angle has an origin, wherein use the origin is the sphere center and defines a spherical initial medium space with λ/2 as the radius, then the initial medium space is the microwave detecting device with adjustable beam angle with the origin is the range of the initial electric field that the zero potential point formed, wherein λ be with the corresponding wavelength parameter of the frequency parameter of the microwave detecting device with adjustable beam angle, wherein for current microwave detecting module, through changing the mode of the medium state of the initial medium space, the energy distribution and the direction of the initial electric field can be changed to form the shaping to the gradient boundary of the corresponding microwave beam.

Another objective of the present invention is to provide a microwave detecting device with adjustable beam angle, wherein the origin is used as the center of sphere, λ/2 is used as the inner radius and 3 λ/2 is used as the outer radius to define a near field medium space, and the near field medium space is the range of the near field formed by the microwave detecting device with adjustable beam angle based on the electromagnetic transformation of the initial electric field, wherein compared with the existing microwave detecting module, by changing the medium state of the near field medium space, the energy loss to the initial electric field is avoided and the normal radiation of the microwave beam can be ensured, and as the energy distribution and direction of the near field are changed, the shaping to the gradient boundary of the microwave beam is correspondingly formed, specifically embodied as the narrowing of the beam angle of the microwave beam and/or the change of the shape of the gradient boundary, therefore, the method is flexible and changeable, and is beneficial to matching the corresponding target detection space in practical application.

Another object of the present invention is to provide a microwave detecting device with adjustable beam angle, wherein the microwave detecting device with adjustable beam angle includes a beam adjusting medium, wherein the beam adjusting medium is located in the near-field medium space, so as to form a change of the medium state of the near-field medium space relative to the existing microwave detecting module.

Another object of the present invention is to provide a microwave detecting device with adjustable beam angle, wherein based on the beam adjustment medium is right the change of the medium state of the near field medium space, the gradient boundary of the microwave beam can be shaped, specifically the beam adjustment medium in the near field medium space is with winding the state that the directional radiation direction of the microwave detecting device with adjustable beam angle is set up, it is right to form the narrowing adjustment of the beam angle of the microwave beam, and it is right to embody the narrowing adjustment of the beam angle of the microwave beam is the energy density of the microwave beam and increase in the radiation distance of the directional radiation direction, thereby being favorable to improving the detection sensitivity and the detection distance of the microwave detecting device with adjustable beam angle.

Another object of the utility model is to provide a microwave detection device of adjustable beam angle, wherein beam adjusting medium in near field medium space is in order to wind the state that microwave detection device of adjustable beam angle's directional radiation direction was set up, the energy density of microwave beam and the radiation distance at directional radiation direction are improved simultaneously, and are corresponding microwave detection device of adjustable beam angle is applicable to more distance range and surveys the human fine motion action including human breathing action and heartbeat action.

Another object of the utility model is to provide a microwave detection device of adjustable beam angle, wherein based on the wave beam is adjusted the medium right the change of the medium state in near field medium space, the microwave beam in practical application in keeping away from near field medium space's one end has more definite and definite gradient boundary, so in order to be favorable to improving the microwave detection device of adjustable beam angle is at corresponding detection distance's interference killing feature.

Another object of the present invention is to provide a microwave detecting apparatus with adjustable beam angle, wherein the beam adjusting medium is preferably disposed in the near field and has a relative permittivity greater than or equal to 5, that is, when the frequency of the electric field where the beam adjusting medium is located is a frequency corresponding to the wavelength parameter λ, the beam adjusting medium has a relative permittivity greater than or equal to 5, so as to improve the manner of the change amount of the beam adjusting medium in the corresponding direction to the energy distribution and direction of the near field under the limitation of the volume of the near field medium space and the beam adjusting medium, that is, to enrich the variety of the change of the medium state of the beam adjusting medium to the near field medium space, which correspondingly facilitates to improve the flexibility of the change of the narrowing of the beam angle of the microwave beam and/or the shape of the gradient boundary, thereby being beneficial to improving the adaptability of the microwave wave beams to the corresponding target detection space.

Another object of the present invention is to provide a microwave detecting device with adjustable beam angle, wherein the beam adjusting medium is set up the movable activity of directional radiation direction of the microwave detecting device with adjustable beam angle, it is right to realize the flexible adjustment of the narrowing range of the beam angle of the microwave beam and/or right the flexible change of the shape of the gradient boundary of the beam angle of the microwave beam, thereby it is right to improve the flexibility of the narrowing adjustment range of the beam angle of the microwave beam and/or the change of the shape of the gradient boundary, which is favorable to improving the adaptability of the microwave beam to the corresponding target detection space.

According to an aspect of the utility model, the utility model provides an adjustable beam angle's microwave detection device, wherein adjustable beam angle's microwave detection device includes:

a planar reference ground;

a radiation source, wherein the radiation source is arranged on one side of the plane reference ground in a state of being spaced from the plane reference ground, and the directional radiation direction of the microwave detection device with the adjustable beam angle is from the plane reference ground to the radiation source direction in the direction perpendicular to the plane reference ground; and

a beam-conditioning medium, wherein the beam-conditioning medium is configured in a ring shape, wherein the adjustable-beam-angle microwave detecting device is configured to operate in a 10.525Ghz band, the beam-conditioning medium has a relative permittivity equal to 20 when the frequency of the electric field in which the beam-conditioning medium is located is a frequency corresponding to a wavelength parameter λ, the beam-conditioning medium has a thickness of 3.5mm within a tolerance range of 20%, wherein the adjustable-beam-angle microwave detecting device has an origin, the origin being a sphere center, and a near-field medium space being defined by an inner radius of λ/2 and an outer radius of 3 λ/2, the near-field medium space being a radiation near-field range of the adjustable-beam-angle microwave detecting device, wherein λ is a wavelength parameter corresponding to a frequency parameter of the adjustable-beam-angle microwave detecting device, wherein the beam adjusting medium is disposed in the near-field medium space in whole or in part with a directional radiation direction around the adjustable beam angle microwave detection device.

In an embodiment, wherein the beam adjusting medium has a height of 14mm within a tolerance of 20%.

In an embodiment, the beam adjusting medium is movably arranged in the directional radiation direction of the adjustable beam angle microwave detecting device.

In an embodiment, the radiation source is arranged in a metal layer and has a conductive surface with a circumference larger than or equal to λ/2, wherein the conductive surface of the radiation source and the reference ground are arranged in a parallel state and spaced from each other, and the origin is located at a projection point of a physical center point of the conductive surface of the radiation source on the plane reference ground in a direction perpendicular to the plane reference ground.

In an embodiment, the inner radius of the beam adjusting medium is greater than or equal to λ/4 and less than or equal to 2 λ, so that the beam adjusting medium is formed to be disposed in a state where the directional radiation direction of the microwave detection apparatus around the adjustable beam angle is wholly or partially set in the near-field medium space within an error range of the near-field medium space.

In an embodiment, wherein the inner radius of the beam adjusting medium is equal to 20 mm.

Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.

Drawings

Fig. 1A is a schematic structural diagram of a conventional microwave detection module.

Fig. 1B is a three-dimensional radiation pattern based on the structure of the microwave detection module.

Fig. 1C is a two-dimensional radiation pattern based on the structure of the microwave detection module described above.

Fig. 2A is a schematic view of a radiation principle of a microwave detecting device with an adjustable beam angle according to an embodiment of the present invention.

Fig. 2B is a schematic perspective view of the radiation principle of the microwave detecting device with adjustable beam angle according to the above embodiment of the present invention.

Fig. 2C is a schematic range diagram of an initial medium space defined by the radiation principle of the adjustable beam angle microwave detecting apparatus according to the above embodiment of the present invention.

Fig. 2D is a schematic range diagram of a near-field medium space defined by the radiation principle of the adjustable beam angle microwave detecting apparatus according to the above embodiment of the present invention.

Fig. 3A is a schematic illustration of the radiation principle of the adjustable beam angle microwave detecting apparatus according to the present invention, illustrating the gradient boundary of the corresponding microwave beam.

Fig. 3B is a schematic illustration of the gradient boundary of the corresponding microwave beam of the adjustable beam angle microwave detecting apparatus in practical application according to the present invention.

Fig. 4 is a schematic structural diagram of the microwave detecting device with adjustable beam angle according to a modified embodiment of the above-mentioned embodiment of the present invention.

Fig. 5A is a schematic structural diagram of the microwave detecting device with adjustable beam angle according to a modified embodiment of the above-mentioned embodiment of the present invention.

Fig. 5B is a schematic partial structural dimension view of the microwave detecting device with adjustable beam angle according to the above modified embodiment of the present invention.

Fig. 5C is a three-dimensional radiation pattern of the adjustable beam angle microwave detecting device according to the above-mentioned modified embodiment of the present invention based on the change of the corresponding parameters.

Fig. 5D is a three-dimensional radiation pattern of the adjustable beam angle microwave detecting device according to the above-mentioned modified embodiment of the present invention, based on the change of the corresponding parameters.

Fig. 6A is a three-dimensional radiation pattern of the adjustable beam angle microwave detecting device according to the above-mentioned modified embodiment of the present invention based on the change of the corresponding parameters.

Fig. 6B is a three-dimensional radiation pattern of the adjustable beam angle microwave detecting device according to the above-mentioned modified embodiment of the present invention based on the change of the corresponding parameters.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "vertical," "horizontal," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 2A to 2D of the drawings attached to the present disclosure, the radiation principle of a microwave detecting device with an adjustable beam angle according to an embodiment of the present invention and an initial dielectric space 100 and a near field dielectric space 200 defined based on the radiation principle are illustrated respectively. Specifically, the adjustable-beam-angle microwave detecting device comprises a plane reference ground 10 and a radiation source 20, wherein the radiation source 20 is disposed on one side of the plane reference ground 10 in a state of being spaced from the plane reference ground 10, so as to form a directional radiation direction of the adjustable-beam-angle microwave detecting device from the plane reference ground 10 to the radiation source 20 in a direction perpendicular to the plane reference ground 10.

Further, the adjustable beam angle microwave detecting device has an origin 300, wherein the origin 300 is a sphere center and λ/2 is a radius to define the spherical initial medium space 100, then the initial medium space 100 is a range of an initial electric field formed by the adjustable beam angle microwave detecting device with the origin 300 being a zero potential point, wherein λ is a wavelength parameter corresponding to a frequency parameter of the adjustable beam angle microwave detecting device, wherein the origin 300 is a sphere center, and λ/2 is an inner radius and 3 λ/2 is an outer radius to define the near field medium space 200, then the near field medium space 200 is a range of a radiation near field formed by the adjustable beam angle microwave detecting device based on electromagnetic conversion of the initial electric field.

It is worth mentioning that the electric fields within λ/2 ± λ/4 from the origin point and within 3 λ/2 ± λ/4 from the origin point have the same rate of change, the definition of the initial medium space 100 allows the radius error of + λ/4, the definition of the near-field medium space 200 allows the radius error of- λ/4 and the outer radius error of + λ/4.

Further, the radiation source 20 is provided in the form of a metal layer and has a conductive surface with a circumference of λ/2 or more, wherein the conductive surface of the radiation source 20 and the plane reference ground 10 are disposed in a parallel state spaced apart from each other, in a state where the radiation source 20 is fed, the radiation source 20 can be coupled with the plane reference ground 10 to establish the initial electric field in the initial dielectric space 100, and forms the radiated near field in the near-field medium space 200 based on the alternating propagation of the electric field and the magnetic field, wherein the radiating near field forms a radiating far field based on further alternate propagation of electric and magnetic fields to form emission of a corresponding microwave beam, the corresponding origin 300 is located at a projection point of a physical center point of the conductive surface of the radiation source 20 in a direction perpendicular to the plane reference ground 10 and to the plane reference ground 10.

That is, the integrity and the energy distribution and the direction of the initial electric field are directly related to the gradient boundary of the microwave beam, corresponding to the variation of the radiation energy of the microwave beam illustrated in fig. 3A and 3B, i.e. the transition region where the radiation of the microwave beam is significantly attenuated from the higher radiation energy to a certain lower radiation energy value, in this embodiment of the present invention, the energy distribution and the direction of the initial electric field are changed based on the manner of changing the medium state of the initial medium space 100, so as to affect the radiation near-field intensity of the corresponding direction, and finally affect the radiation energy distribution of the microwave beam, so as to form the shaping of the gradient boundary of the corresponding microwave beam, mainly embodied as the adjustment of the beam angle of the microwave beam, thereby being beneficial to improve the adaptability of the microwave detection device with adjustable beam angle to the corresponding target detection space, in practical application, based on the difference between the response levels of the microwave detection doppler signals of the human body movement motion and the vehicle movement in the detection area and the non-detection area, the detection accuracy of the microwave detection device with the adjustable beam angle on the detection area and the performance of resisting the interference of the non-detection area are improved.

Specifically, referring to fig. 4 of the drawings of the present application, the microwave detecting device with adjustable beam angle includes a beam adjusting medium 40, wherein the beam adjusting medium 40 is located in the near-field medium space 200 in whole or in part, and is specifically set in a direction of directional radiation around the microwave detecting device with adjustable beam angle, so as to form a change to the medium state of the near-field medium space 200 with respect to an existing microwave detecting module, specifically form an adjustment to the beam angle of the microwave beam and simultaneously maintain the energy density of the microwave beam in the direction of directional radiation of the microwave detecting device with adjustable beam angle.

It is worth mentioning that the beam adjusting medium 40 is movably arranged in the directional radiation direction of the adjustable-beam-angle microwave detection device, such that the distance between the radial direction of the beam adjusting medium 40 in the directional radiation direction of the adjustable-beam-angle microwave detection device and the radiation source 20 is adjustable, such that by adjusting the distance between the radial direction of the beam adjusting medium 40 in the directional radiation direction of the adjustable-beam-angle microwave detection device and the radiation source 20, a flexible adjustment of the narrowed range of the beam angle of the microwave beam and/or a flexible change of the shape of the gradient boundary of the beam angle of the microwave beam is achieved, thereby increasing the flexibility of the shape of the narrowed adjustment range of the beam angle of the microwave beam and/or the gradient boundary, the adaptability of the microwave wave beam to the corresponding target detection space is improved.

In particular, the beam-adjusting medium 40 is configured in a ring shape, wherein the inner radius of the beam-adjusting medium 40 is greater than or equal to λ/4 and less than or equal to 2 λ, wherein the beam angle of the corresponding microwave beam is adjusted as the distance between the radial direction of the directional radiation direction of the adjustable-beam-angle microwave detection device and the radiation source 20 of the beam-adjusting medium 40 is adjusted, so that flexible adjustment of the narrowed range of the beam angle of the microwave beam and/or flexible change of the shape of the gradient boundary of the beam angle of the microwave beam is achieved, thereby improving flexibility of changing the narrowed adjustment range of the beam angle of the microwave beam and/or the shape of the gradient boundary, and facilitating improvement of adaptability of the microwave beam to the corresponding target detection space.

It is worth mentioning that the narrowing adjustment of the beam angle of the microwave beam is embodied as the simultaneous increase of the energy density of the microwave beam and the radiation distance in the directional radiation direction, so that the detection sensitivity and the detection distance of the microwave detection device with the adjustable beam angle are improved, and the microwave detection device with the adjustable beam angle is suitable for detecting the human body micro-motion actions including the human body breathing action and the heartbeat action in a larger distance range.

In a specific example, specifically referring to fig. 5A and 5B of the drawings of the present invention, in this example, the adjustable beam angle microwave detecting device is configured to operate in a 10.525Ghz band, and the beam adjusting medium 40 is preferably configured to have a relative dielectric constant of 20 or more in the radiated near field, that is, when the frequency of the electric field in which the beam adjusting medium 40 is located is a frequency corresponding to the wavelength parameter λ, the beam adjusting medium 40 has a relative dielectric constant of 20 or more, and the beam adjusting medium 40 is configured to have a height of 14mm and a thickness of 3.5mm, it should be understood by those skilled in the art that, based on errors of process and measurement, in the description of the present invention, the description of the size of the beam adjusting medium should be understood as the size of an error range of 20%, in other words, i.e. the beam-adjusting medium has a height of 14mm and a thickness of 3.5mm within a tolerance range of 20%, wherein a flexible adjustment of the narrowed range of the beam angle of the microwave beam is achieved by the beam-adjusting medium 40 being movably movable in the directional radiation direction of the adjustable-beam-angle microwave detection device, i.e. by adjusting the distance between the radial direction of the beam-adjusting medium 40 in the directional radiation direction of the adjustable-beam-angle microwave detection device and the radiation source 20.

In this example, in which the beam adjusting medium 40 is specifically set to have an inner radius of 20mm, as shown in figures 5C and 5D of the drawings accompanying the present invention, figures 5C and 5D correspond to radiation patterns in which the distance between the radiation source 20 and the radial direction of the beam adjusting medium 40 in the directional radiation direction of the adjustable beam angle microwave detection means is adjusted to 7mm and 2.5mm respectively, wherein the distance between the radial direction corresponding to the directional radiation direction of the microwave detection device with the adjustable beam angle of the beam adjusting medium 40 and the radiation source 20 is 7mm, the beam angle of the respective microwave beam is smaller than the beam angle of the microwave beam when the distance between the radial direction of the directional radiation direction of the adjustable beam angle microwave detection device and the radiation source 20 of the beam adjusting medium 40 is 2.5 mm.

Therefore, in practical use, the beam angle of the microwave beam can be flexibly adjusted based on adjusting the distance between the radial direction of the directional radiation direction of the microwave detection device with the adjustable beam angle of the beam adjusting medium 40 and the radiation source 20, so that the beam angle of the microwave beam can be adjusted based on practical application requirements, thereby increasing the adaptability of the microwave detection device with the adjustable beam angle to different application scenes in practical application, improving the practicability of the microwave detection device with the adjustable beam angle, being beneficial to reducing the cost of the microwave detection technology in practical application, having great significance to the popularization of the microwave detection technology, and the narrowing adjustment of the beam angle of the microwave beam is embodied as the increase of the energy density of the microwave beam and the radiation distance in the directional radiation direction, the detection sensitivity and the detection distance of the microwave detection device with the adjustable beam angle are favorably improved, the detection sensitivity and the detection distance are correspondingly improved, the microwave detection device with the adjustable beam angle is suitable for detecting the human body micro-motion action comprising the human body respiration action and the heartbeat action in a larger distance range, the detection precision of the microwave detection device with the adjustable beam angle in practical application is improved, and the practicability and the detection accuracy of the microwave detection device with the adjustable beam angle are improved.

Further, wherein the narrowing adjustment effect on the beam angle of the microwave beam is different based on the difference of the relative dielectric constant of the beam adjusting medium 40 in the radiation near field, further by way of example, specifically referring to fig. 5C, 6A and 6B of the drawings of the present application, wherein the distance between the radial direction of the beam adjusting medium 40 in the directional radiation direction of the adjustable beam angle microwave detecting device and the radiation source 20 is adjusted to 7mm, fig. 5C, 6A and 6B respectively correspond to the beam adjusting medium 40 being disposed in the radiation near field having the relative dielectric constant equal to 20, equal to 4.4 and equal to 3.55, wherein each of the beam adjusting media 40 having the different relative dielectric constant in the radiation near field has the adjustment effect on the beam angle of the microwave beam, as shown in fig. 5C, in a state where the beam adjusting medium 40 has a relative permittivity equal to 20 in the radiated near field, the beam angle of the microwave beam is significantly narrowed with respect to the existing microwave detection module.

It is worth mentioning that, based on the purpose of narrowing the beam angle of the microwave beam, the beam adjusting medium 40 is preferably arranged such that the radiated near field has a relative permittivity greater than or equal to 5, that is, when the frequency of the electric field in which the beam adjusting medium 40 is located is a frequency corresponding to the wavelength parameter λ, the beam adjusting medium 40 has a relative permittivity greater than or equal to 5, so as to increase the amount of change of the energy distribution and direction of the beam adjusting medium 40 in the corresponding direction to the near field under the volume limitation of the near field medium space 200 and the beam adjusting medium 40, that is, to enrich the diversity of the change of the medium state of the near field medium space 200 by the beam adjusting medium 40, particularly in a state where the beam adjusting medium 40 is arranged in the near field medium space 200 so as to surround the directional radiation direction of the microwave detecting device with adjustable beam angle, flexibility in narrowing the adjustment range of the beam angle of the microwave beam and/or changing the shape of the gradient boundary is improved, thereby facilitating improvement of adaptability of the microwave beam to the corresponding target detection space.

In particular, in an embodiment, the beam adjusting medium 40 is disposed in the near-field to be radiated and has a relative dielectric constant equal to 20, that is, when the frequency of the electric field in which the beam adjusting medium 40 is located is a frequency corresponding to the wavelength parameter λ, the beam adjusting medium 40 has a relative dielectric constant equal to 20, for example, the beam adjusting medium 40 is made of ceramic, so as to control the production cost of the microwave detecting device with adjustable beam angle while achieving adjustment of the beam angle of the microwave beam, and ensure the performance of the microwave detecting device with adjustable beam angle, which is beneficial to reducing the cost of the microwave detecting technology in practical application, and has great significance for popularization of the microwave detecting technology.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. An adjustable beam angle microwave detection apparatus, comprising:

a planar reference ground;

2. The adjustable beam angle microwave detection apparatus of claim 1 wherein the beam conditioning medium has a height of 14mm within a 20% tolerance.

3. The adjustable-beamangle microwave detection apparatus of claim 2, wherein the beam-conditioning medium is movably disposed in a directional radiation direction of the adjustable-beamangle microwave detection apparatus.

4. The adjustable beam angle microwave detection device of claim 3, wherein the radiation source is disposed in a metal layer form and has a conductive surface with a circumference of λ/2 or more, wherein the conductive surface of the radiation source and the reference ground are disposed in a parallel state spaced apart from each other, wherein the origin point is located at a projection point of a physical center point of the conductive surface of the radiation source to the plane reference ground in a direction perpendicular to the plane reference ground.

5. The tunable beamangle microwave detection apparatus of claim 4, wherein the beam-conditioning medium has an inner radius of greater than or equal to λ/4 and less than or equal to 2 λ such that the beam-conditioning medium is formed to be disposed entirely or partially in the near-field medium space around the directional radiation direction of the tunable beamangle microwave detection apparatus within the error range of the near-field medium space.

6. The adjustable beam angle microwave detection apparatus of claim 5 wherein the inner radius of the beam conditioning medium is equal to 20 mm.